Free to use Raster / Vector / GIS real world data

Here is a list of sites which has free to use real world data - but please check the site itself to make sure you are aware of all conditions of use and whether it's still free:

Blank Map - Has world, continent and country maps in EPS, PDF, GIF and PNG formats. A real treasure trove.

Dmaps.com - Lots of maps but all in .gif format (no vector so far as I can see)

Education Place - Lots of continental blank maps and some US historical blank maps too.

Diva - GIS data sets, under a CC licence.

Natural Earth Data - GIS datasets and some raster shaded relief.

Shoreline Coastline database - GIS database

Maps for Free - Based on Google Earth

Please feel free to add to the list!